<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <body>
    <script>
      class MyPromise {
        constructor(fn) {
          this["[[PromiseState]]"] = "pendding";
          this["[[PromiseResult]]"] = undefined;
          console.log(this);
          fn(this.#_resolve.bind(this), this.#_reject.bind(this));
        }
        #_resolve(res) {
          this["[[PromiseState]]"] = "fulfilled";
          this["[[PromiseResult]]"] = res;
          console.log("lll");
        }

        #_reject(err) {
          this["[[PromiseState]]"] = "rejected";
          this["[[PromiseResult]]"] = err;
        }
      }

      let p = new MyPromise((resolve, reject) => {
        resolve("success");
      });
      console.log(p);
    </script>
  </body>
</html>
